Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Th. Dufau
R. A. van Sandick
Alfred Edmund Brehm
Hugo de Vries
A. A. Pulle
Tom Tit
W.-F. Rondou
Charles Darwin
Hieronymus David Gaubius
Willem Cornelis van Zijll
Albert Daiber
Jan Swammerdam
Anton Pannekoek
Gerrit Verschuur
Gaston Tissandier
Antoni van Leeuwenhoek
Jules Verne
Jakob Kloppenburg and Pieter Faddegon
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H. G. Wells
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.